Apparatus for the optical projection of colored images.



B. JUMEAUX.

APPARATUS FOR THE OPTIGAL PROJECTION 0F GOLORED IMAGES.

APPLICATION FILED FEB. 5, 1907.

944,787. Patented Dec.28, 1909.

I III II:

A [zany/p 02" %/"/7&95e: 1 2,; m .%f v I l useful improvements UNITEDs'rA Es FATENT OFFICE.

BENJAMIN JU'MEAUX, 0F SOUlI-I'WICK,

NEAR BRIGHTON, ENGLAND.

APPARATUS FOR THE OPTICALPROJECTION OF COLORED IMAGES.

sewer.

To all whom it may concern:

Be it known that I, BENJAMIN JUMEAUX, M. R. C. S., L. R. ,C. P., asubject of the King of Great Britain, residing at Southwick, nearBrighton, in the county of Suesex, England, have invented certain-newand Relating to Appara- Projection of Colored tus for the Opticalfollowing is a specifi- Images, of which the cation. I

This invention relates to apparatus for the optical projection ofcolored images, the objects being to heighten the effectiveness of theapparatus and to remove some of the defects heretofore existing therein.

In the method of projection inwhich one lens has been used to projectall three color records, it has been proposed to employ in front of suchlens single and double reflectors or mirrors for superim osing theimages from" such color recor s or positives, but these means are notfound to be attended With entire success owing to the mirrors givingmultiple reflections and thereby marring the effect of the projectedimages, besides which there is much loss of light; Moreover, when onelens is used for projection of all three'records in combination withmirrors for causing thesu er position of the images of such records, itis diflicult to adjust the mirrors in the path of the beam from one suchrecord without interfering with the beam from another record. Prisms ofthe refracting type have, moreover, been proposed for use w th what areknown as animated pictures in colors; and prisms of the Fresnel rhombtype have also been proposed for the purpose of superimposing andsplitting up images in apparatus of the type referred to withthe resultthat the incident axial ray emerges parallel to itself.

According to the present invention I employ a separate projecting lensfor each color record and thus formed on the screen by means 0 a form ofreflecting prism or prisms having faces arranged at such angle or anglesas may be necessary to cause the light rays to converge;to-any desiredpoint. Thetype of prism is therefore such as to give two internalreflections and is designed so that the faces ofthe prism at which thebeam enters and emerges are normal to such entering and emerging beam. 1

"he present invention consists in so modifying the prisms of the Fresneltype above superimpose the ima es.

Specification of Letters Patent holders or carriers (1 \horizontally bymeans 2 screens 0 c c say,

referred to as to parallel to the axis of the lens to emerge making anangle with that axis and so make it possible to correctly superpose theimages.

The prism or prisms may be mounted in suitable holders or carriersadapted for adj ustment in a vertical and horizontal plane,

universal movement. By these means the prisms may be adjusted so as topermit the superimposing of the images to be effected with accuracy.-When projecting three color records with three projecting lenses asabove described I preferably project one image direct on to the screenwithout the intervention the other two images to register with the firstby means of of a prism and then cause prisms arranged in front'of theother two lenses.

The prism may be conveniently arranged with respect to the lenses, andto the posi tives or records. The color screen's may be placed before orbehind the positives, before, behind, or inside the lens, before orbehind the prisms; or the prisms may themselves be of a suitable color.

In order that the invention may be clearly understood and readilycarried into effect I will proceed to describethe same with reference tothe examples illustrated in the accompanying drawing in which Figure 1represents diagrammatically a sectional View of'the improved apparatus.

Fig. 2 is a corresponding view at right angles to Fig. 1 showing taviews of the carrier adjusting mechanlsm. The prisms a a. are mounted insuitable (Figs. 3 and 4:) so as to be capableof adjustment in a verticaland horizontal lane. The carriers 00 are mounted on the s ides a and canbe adjusted vertically relatively thereto by rack and pinion mechanism aoperated by the milled heads a. The slides a? are mounted on thesupports a and are capable of being adjusted of rack and pinionmechanism a operated by the milled heads a Behind the pjrisms arearranged the lenses 6, b, b and ehind these again the color green,blue'and red re- 01 being the film carrying the spectively projected onthe positives or subjects to be Patented Dec. 28, 1909.

- Application filed February 5, 1907. Serial No. 355,851.

cause the rays which enter e. the prism or prisms may be adapted for Yscreen a and adapted for being unrolled and I the rollers pertain- I ein .to the film; Figs. 3 and 4: represent derolled upon rollers e e. Thebody of the camera is indicated at f; the usual condenser f beingemployed as Will be well understood. A suitable shutter 9 also indicatedin dotted lines may be arranged for operation as required. The aforesaidprisms a a, are formed with faces arranged at such P rays. It Will beseen that the blue ligl'it rays take a direct line or course asindicated by the line 0* While the green light rays and the red lightrays take a lineor course, in dicated by the lines 0 and 0 respectivelywhich represent the angles of incidence and reflection in each case; thecenter lines only being shown for the sake of clearness; Of course theangles of the faces pertaining to the prisms will Vary according torequirethe degree of convergence necessary but by means of the presentinvention a correct projection and superimposing of the images isinsured; the colors being truly registered and blurring effects entirelyobviated.

It will thus be seen that the employment of reflecting prisms in theprojection of a that three color screens are disposed between thesubject and the film; the three negatives being taken simultaneously onthe film. What I claim and desire to secure by Let ters Patent of theUnited States is 1. In apparatus for the optical projection of coloredpictures by the superimposition of a plurality of 111OIlO-Ch10111l0images, the

combination of doubly reflecting prisms having non-parallel faces,lenses arranged behind the said prisms, and color screens disposedbehind the lenses.

2. In apparatus for the optical projection of colored images, thecombination of doubly reflecting prisms of the Fresnel type having theface at the base normal to the incident rays, the side facesconvergently arranged to cause a double reflection, the variation of theangle between the emergent face andtlnabase being in direct proportionto the variation required to superimpose the emergent rays and the faceremote from the base at a right angle to the emergent rays, lensesarranged behind the said prisms and color screens disposed behind thelenses for each of the respective superimposed images.

In apparatus for the optical projection of colored images, thecombination of two doubly reflecting prisms of the Fresnel type mentsand to the distance of the screen and 1' having the face at the basenormal to the incident rays, the side faces convergently arranged tocause a double reflection, the variation of the angle between theemergent face and the base being in direct proportion to the variationrequired to superimpose the emergent rays and the face remote from thebase at a right angle to the emergent rays, three lenses, arrangedbehind the plane of the said prisms, and three color screens arrangedbehind the respective lenses.

In testimony whereof I affix my signature in presence of two witnesses.

BENJAMIN J UMEAUX. Witnesses:

ARTHUR DUDLEY Wnsrnnoon,

J OHN DUNCAN STEWART.

